Rotary forging furnace



R. M. HORTVET April 1, 1930.

ROTARY FORGI NG FURNACE Filed June 15, 1928 3 Sheets-Sheet 1 April 1930. R. M. HORTVET 1,752,433

ROTARY FORGING FURNACE Filed June 15. 1928 5 Sheets-Sheet 2 t1 d} W xx N PP E:

In yen for:

Patented Apr. 1, 1930.

UNITED STATES RICHARD M. H OR'PVET, OI MINNEAPOLIS, MINNESOTA, ASSIGNOR TO MAKE MANU- PATENT OFFICE FACTUBING COMPANY, OF MINNEAPOLIS, MINNESOTA, A CORPORATION ROTARY FOBGING FURNACE Application filed June 15,

My invention relates to rotary forging fur naces, and while intended more particularly L flanges 30 and the butti for heating metal to be forged, it may be employed for annealing also.

means for preventing heating'of the operating mechanism for aturntable with which in place for rotative movement, and the pro.

vision of means for protecting the operator from the heat of the furnace.

The full objects and advantages of my invention will appear in connection with the detailed description thereof, and the novel features of my inventive idea will be particularly pointed out in the claims.

In the accompanying drawings which illustrate a practical embodiment of my invention, Fig. 1 is a front elevational view .of the furnace. Fig. 2 is a view thereof in horizontal section on the line 22 of Fig. 3. Fig. 3 is a view in central vertical section. Fig. 4 is a view in horizontal section on the line 4-4 of Fig. 3. Fig. 5 is a fragmentary View in vertical section on the line 5-5 of Fig. 4. Fig. 6 is a fragmentary view in vertical section on the line 6-6 of Fig. 4.

As shown in the drawings, I provide a foundation 10 containing an annular pit 12 from the center of which the foundation extends upwardly in the form of steps 14, 16,

and 18 having circul'ar'outer margins. The

foundation wall around the pit 12 has a level top surface 20 upon which rest a circular series of narrow castings 22 which are spaced from each other at considerable distances as will be apparent from Fig. 2. Above the castings 22, there is a circular series of hollow castings 24 which butt against each other and are secured by bolts 26 passing through the bottoms thereof and through flanges on the castings 22. The castings 24 are open at their inner top portions while their outer top portions consist of walls 28 as will be seen in Figs. 3 and 5, the inner margins of said walls being provided with downturned flanges'30. As will'be understood from Fig. 2, the walls of the castings 24 which butt against each other extend inwardly only a Among the objects of the invention arethe provision of 1928. Serial N0. 285,687.

far as the top walls so that there is an annular' passageway "between the butting S or similar granular material to form a seal as will presently appear. The upper end of the wall 36 extends above the furnace top 43 and contains an annular flue 44 with which a stack 46 is connected. The step 14 and the foundation surface 20 constitutes supports for a number of bridging members 48 I which carry bearings for horizontal rollers 50. The step 16 supports bearings fora numher of horizontal rollers 52. The step 18 constitutes a support for a circular member 54 having an upstanding circular flange 56 which carries bearings] for a number of ver tical rollers 58. The bottom of the furnace proper is constituted by a refractory turntable 60, the bottom of which consists of sheet metal 62 having an outwardly disposed downwardly extending circular member 64 which rests upon the rollers 50 and having an inwardly disposed downwardly extending circular member 66 which rests upon the rollers 52. The sheet metal 62 also has a central depending circular flange 68 which fits nicely within the surrounding vertical rollers 58. The sheet metal 62 also carries an underlying ring gear 70 with which meshes a beveled pinion 72 shown in F1g. 2, thls pimon being secured to a shaft 74 driven from any suitable source of power and havlng'a hearing 76 for its inner end supported on the step 16'. The turntable also carries a downwardly depending annular flange 77 WhlCh "extends down outside the con oint wall 32. The furnace wall 36 contams 'a charg1ng opening 78 from the bottom of which a grid 80 extends outwardly. Across the bottom of the opening 78, there is a pipe 82 in the upp r.

side of which are perforations directed toward a vertical flue 84 in the furnace wall communicating with the annular flue 44 leading to the stack. The pipe 82 is provided with a shutoff valve 86 and is connected to a suitable source of air under pressure. The furnace wall 36 contains a number of openin s 88 for receiving the tips 90 of suitable fluid fuel burners such as disclosed in my Patent Number 1,673,194, issued June 12, 1928. The openings 88 are disposed between the top and bottom of the fire chamber of the furnace while flues 92 extend from near the bottom of the fire chamber up into the annular flue 44. i

, The operation and advantages of my invention will be understood in connection with the foregoing description. The operator stands in front of the charging opening 78 and places the articles to be heated upon the turntable and removes them therefrom at the proper time. He is protected from the heat of the furnace by a coldair screen produced by the blast of air directly upwardly .from the perforated pipe 82. This blast of air passes upto the stack 46 and thus in--' creases the draft of the furnace. The heat delivered through the openings 88 finds its wayto the stack through the flues 92'. As will be understood from Fig. 5, the flange 77 of the turntable rotates in the layer of sand or other granular material so that a seal is pro-' around the operating mechanism. The openjoint action of the horizontal rollers 50 and 52 and the vertical rollers '58. I claim: a

1. In a rotary forging furnace, the combination of a foundation, a circular series of castings mounted around said foundation in spaced relation to each other, a furnace wall supported by said castings, a turntable within said wall, operating mechanism for said turntable underneath the latter, and sealin means between the interior of the furnace an said operating mechanism.

2. In a rotary forging furnace, the combi nation of a foundation, a circular series of castings mounted around said foundation in spaced relation to each other, a circular series of castings butted together and carried by ,said first castings, a furnace wallmounted OD SBJd second castings, a turntable within wall mounted on the outer portions of said hollow castings, a turntable within said fur- I nace wall, operating mechanism for said turntable underneath the latter and above said pit, and a circular flan e extending downwardly from said turnta le into said granular material. I

In testimony whereof I hereunto aflix my signature.

RICHARD M. HORTVET. 

